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#atomic number #44 #element 44 #number 44

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#atomic #nuclear #element 44 #atomic number 44 #number 44

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#ruthenium #ru #element 44 #atomic number 44 #ruthenia

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#44 #atomic number 44 #element 44

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#element number #44 #atomic number 44 #number 44 #element 44

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#ruthenium #atomic number 44 #hard metal #brittle metal #element 44 #industrial use